package fr.ssd.jvc.ui;

import java.awt.BorderLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.IOException;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

import fr.ssd.jvc.JavaVersionChecker;
import fr.ssd.jvc.io.Find;

public class JvcUI extends JPanel implements ActionListener {
	static private final String newline = "\n";
	
	JavaVersionChecker jvc;
	JButton openButton;
	JButton clearButton;
	JTextArea log;
	JFileChooser fc;

	public JvcUI() {
		super(new BorderLayout());

		jvc = new JavaVersionChecker();
		
		// Create the log first, because the action listeners
		// need to refer to it.
		log = new JTextArea(5, 40);
		log.setMargin(new Insets(5, 5, 5, 5));
		log.setEditable(false);
		JScrollPane logScrollPane = new JScrollPane(log);

		// Create a file chooser
		fc = new JFileChooser();

		// Uncomment one of the following lines to try a different
		// file selection mode. The first allows just directories
		// to be selected (and, at least in the Java look and feel,
		// shown). The second allows both files and directories
		// to be selected. If you leave these lines commented out,
		// then the default mode (FILES_ONLY) will be used.
		//
		// fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
		 fc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);

		// Create the open button. We use the image from the JLF
		// Graphics Repository (but we extracted it from the jar).
		openButton = new JButton("Open class or directory");
		openButton.addActionListener(this);

		clearButton = new JButton("Clear");
		clearButton.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent e) {
				log.setText("");
			}
		});
		// For layout purposes, put the buttons in a separate panel
		JPanel buttonPanel = new JPanel(); // use FlowLayout
		buttonPanel.add(openButton);
		buttonPanel.add(clearButton);

		// Add the buttons and the log to this panel.
		add(buttonPanel, BorderLayout.PAGE_START);
		add(logScrollPane, BorderLayout.CENTER);
	}

	public void actionPerformed(ActionEvent e) {

			int returnVal = fc.showOpenDialog(JvcUI.this);

			if (returnVal == JFileChooser.APPROVE_OPTION) {
				File file = fc.getSelectedFile();
				if(file.isDirectory()){
					for(File f : Find.find(file)){
						handleFile(f);
					}
				}else{
					handleFile(file);
				}
				
			}
			log.setCaretPosition(log.getDocument().getLength());

			// Handle save button action.

	}
	
	private void handleFile(File file){
		log.append(file.getAbsolutePath());
		log.append(" : ");
		try {
			log.append(jvc.checkClassVersion(file.getAbsolutePath()));
		} catch (IOException e1) {
			log.append(e1.getMessage());
		}
		log.append(newline);
	}

	/** Returns an ImageIcon, or null if the path was invalid. */
	protected static ImageIcon createImageIcon(String path) {
		java.net.URL imgURL = JvcUI.class.getResource(path);
		if (imgURL != null) {
			return new ImageIcon(imgURL);
		} else {
			System.err.println("Couldn't find file: " + path);
			return null;
		}
	}

	/**
	 * Create the GUI and show it. For thread safety, this method should be
	 * invoked from the event dispatch thread.
	 */
	private static void createAndShowGUI() {
		// Create and set up the window.
		JFrame frame = new JFrame("Java Version Checker");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		// Add content to the window.
		frame.add(new JvcUI());

		// Display the window.
		frame.pack();
		frame.setVisible(true);
	}

	public static void main(String[] args) {
		// Schedule a job for the event dispatch thread:
		// creating and showing this application's GUI.
		SwingUtilities.invokeLater(new Runnable() {
			public void run() {
				// Turn off metal's use of bold fonts
				UIManager.put("swing.boldMetal", Boolean.FALSE);
				createAndShowGUI();
			}
		});
	}
}